Hi,

I guess this is an extremely silly question but...

I often read that the ideal PG/OSD ratio should be 100-200 PGs per OSD.
How is this calculated?

When I do "ceph -s" it correctly says I have 320 PGs in 5 pools.
However, this doesn't account for the replicas, does it?

I mean I have the following table which shows how many PGs of which pool
are stored on which osd.


pool :  1       2       3       4       5       | SUM
--------------------------------------------------------
osd.0   7       5       7       11      24      | 54
osd.1   16      18      15      37      26      | 112
osd.2   9       9       10      16      30      | 74
osd.3   6       12      9       11      23      | 61
osd.4   8       10      9       16      29      | 72
osd.5   10      14      9       17      17      | 67
osd.6   7       17      10      27      27      | 88
osd.7   11      17      11      22      38      | 99
osd.8   14      14      11      15      23      | 77
osd.9   8       12      5       20      19      | 64
--------------------------------------------------------
SUM :   96      128     96      192     256     |


If I sum up all last columns I am clearly above 320... So 100/OSD or
200/OSD: Does it mean *AFTER* taking into account all replicas?


Regards
Martin


-- 
"Things are only impossible until they're not"
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